EghtesadOnline: Former President Bill Clinton portrayed his wife Hillary on Tuesday as a dynamic force for change and a longtime fighter for social justice as he made a case for her historic 2016 bid for the White House.

The ex-president told the Democratic Party convention in Philadelphia that Hillary Clinton was "a natural leader" with an in-built sense of responsibility, according to Reuters.

"Hillary is uniquely qualified to seize the opportunities and reduce the risks we face, and she is still the best darn change-maker I have ever known," he said.

Earlier in the day, Hillary Clinton secured the Democratic Party's nomination for the Nov. 8 election, coming back from a stinging 2008 defeat in her first White House run and surviving a bitter primary fight to become the first woman to head the ticket of a major party in U.S. history.

Bill Clinton told the convention in a keynote speech that Hillary had been an activist for social justice since the couple's early days as law students together. He told how she gave legal aid services to poor people and went undercover to expose a segregationist school in Alabama in the 1970s.

After a tough battle with U.S. Senator Bernie Sanders during the state-by-state nominating contests, Clinton is now the party's standard-bearer against Republican nominee Donald Trump.

Bill Clinton said Republicans led by Trump had made Hillary out to be "a cartoon" but the real thing was nothing like the their portrayal of her.

"They’re running against a cartoon. Cartoons are two-dimensional, they’re easy to absorb. Life in the real world is complicated and real change is hard, and a lot of people even think it’s boring," he said.